A Study to Detect Urban Changes and its Relationship to Flash Flood in Thiruvanathapuram City

Thiruvanathapuram is the capital city of Kerala state. As the city is completely effected by flood, but within in the local bodies there are few low-lying areas which are susceptible to flash flood. The urban expansion which due to the increase in population are affected by the lack of proper drainage system and also due to the uncontrolled increase in concrete space,which leads to the encroachment happening near the canal area,decrease in land such as paddy field,ponds etc.Landsat 5 and 8 images are used in the analysis to detect land use changes in the city, which gives the idea of conversion of vegetation land to built up.Digital elevation model is used in the preparation of contour maps.The result of this study shows use of landsat images in detecting the land use changes, the blue green network which has been mentioned in the master plan of Thiruvanathapuram are also discussed and the various measures which to be adopted to make the city stable to urban flash flood. Citation: Divya Shaji, Sardar Vallabhbhai National Institute of Technology,Surat; Dr. J. E. M. Macwan ,Sardar Vallabhbhai National Institute Of Technology,Surat. "A Study to Detect Urban Changes and its Relationship to Flash Flood in Thiruvanathapuram City." Global Research and Development Journal For Engineering 28 2017: 18 - 27.